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 #include &lt;QtNetwork&gt;

 #include &quot;client.h&quot;
 #include &quot;connection.h&quot;
 #include &quot;peermanager.h&quot;

 static const qint32 BroadcastInterval = 2000;
 static const unsigned broadcastPort = 45000;

 PeerManager::PeerManager(Client *client)
     : QObject(client)
 {
     this-&gt;client = client;

     QStringList envVariables;
     envVariables &lt;&lt; &quot;USERNAME.*&quot; &lt;&lt; &quot;USER.*&quot; &lt;&lt; &quot;USERDOMAIN.*&quot;
                  &lt;&lt; &quot;HOSTNAME.*&quot; &lt;&lt; &quot;DOMAINNAME.*&quot;;

     QStringList environment = QProcess::systemEnvironment();
     foreach (QString string, envVariables) {
         int index = environment.indexOf(QRegExp(string));
         if (index != -1) {
             QStringList stringList = environment.at(index).split(&quot;=&quot;);
             if (stringList.size() == 2) {
                 username = stringList.at(1).toUtf8();
                 break;
             }
         }
     }

     if (username.isEmpty())
         username = &quot;unknown&quot;;

     updateAddresses();
     serverPort = 0;

     broadcastSocket.bind(QHostAddress::Any, broadcastPort, QUdpSocket::ShareAddress
                          | QUdpSocket::ReuseAddressHint);
     connect(&amp;broadcastSocket, SIGNAL(readyRead()),
             this, SLOT(readBroadcastDatagram()));

     broadcastTimer.setInterval(BroadcastInterval);
     connect(&amp;broadcastTimer, SIGNAL(timeout()),
             this, SLOT(sendBroadcastDatagram()));
 }

 void PeerManager::setServerPort(int port)
 {
     serverPort = port;
 }

 QByteArray PeerManager::userName() const
 {
     return username;
 }

 void PeerManager::startBroadcasting()
 {
     broadcastTimer.start();
 }

 bool PeerManager::isLocalHostAddress(const QHostAddress &amp;address)
 {
     foreach (QHostAddress localAddress, ipAddresses) {
         if (address == localAddress)
             return true;
     }
     return false;
 }

 void PeerManager::sendBroadcastDatagram()
 {
     QByteArray datagram(username);
     datagram.append('@');
     datagram.append(QByteArray::number(serverPort));

     bool validBroadcastAddresses = true;
     foreach (QHostAddress address, broadcastAddresses) {
         if (broadcastSocket.writeDatagram(datagram, address,
                                           broadcastPort) == -1)
             validBroadcastAddresses = false;
     }

     if (!validBroadcastAddresses)
         updateAddresses();
 }

 void PeerManager::readBroadcastDatagram()
 {
     while (broadcastSocket.hasPendingDatagrams()) {
         QHostAddress senderIp;
         quint16 senderPort;
         QByteArray datagram;
         datagram.resize(broadcastSocket.pendingDatagramSize());
         if (broadcastSocket.readDatagram(datagram.data(), datagram.size(),
                                          &amp;senderIp, &amp;senderPort) == -1)
             continue;

         QList&lt;QByteArray&gt; list = datagram.split('@');
         if (list.size() != 2)
             continue;

         int senderServerPort = list.at(1).toInt();
         if (isLocalHostAddress(senderIp) &amp;&amp; senderServerPort == serverPort)
             continue;

         if (!client-&gt;hasConnection(senderIp)) {
             Connection *connection = new Connection(this);
             emit newConnection(connection);
             connection-&gt;connectToHost(senderIp, senderServerPort);
         }
     }
 }

 void PeerManager::updateAddresses()
 {
     broadcastAddresses.clear();
     ipAddresses.clear();
     foreach (QNetworkInterface interface, QNetworkInterface::allInterfaces()) {
         foreach (QNetworkAddressEntry entry, interface.addressEntries()) {
             QHostAddress broadcastAddress = entry.broadcast();
             if (broadcastAddress != QHostAddress::Null &amp;&amp;
                 entry.ip() != QHostAddress::LocalHost) {
                 broadcastAddresses &lt;&lt; broadcastAddress;
                 ipAddresses &lt;&lt; entry.ip();
             }
         }
     }
 }</pre>
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